[ts-7000] Floating Point problems with supplied JFFS2 image

["genosensor" <>]

Has anyone else tried running applications use floating
point under the minimal JFFS2 Linux distro supplied with
the TS-7200?

I've been unable to get much of any non-trival floating
point operations work in this environment, even using the
compiler toolchain binaries provided on the CDROM.

I'd be very grateful if a few people could run this test
program on their TS-7200's can get back to me.

Remember, it works fine under Debian.  Boot from the
JFFS2 image to see the failures.  If anyone _can_ get this
to work in that environment, _please_ do tell me all
about your toolchain and/or any other relevant voodoo.

Thanks :-)

I build with:

$ /arm/bin/gcc -o fptest -lm fptest.c

Substitute the path to your arm gcc for /arm/bin/gcc

On the TS-7200, run it with:

$ fptest -4.3

The correct output follows.
Note that under the JFFS2 image, a few of the
functions return bogus results and the exp() fn usually
causes a segfault.


atof(-4.3) = -4.3 = 33 33 11 c0 33 33 33 33
sscanf(-4.3, "%f", &f) assigns f = -4.3 = 9a 99 89 c0
(int)-4.3 = -4 = fc ff ff ff
fabs(-4.3) = 4.3 = 9a 99 89 40
ceilf(-4.3) = -4 = fc ff ff ff
ceil(-4.3) = -4 = 50 8e 00 00
exp(-4.3) = 0.0135686 = a7 4e 5e 3c

-----------------
fptest.c
-----------------

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

void dumphex (void *adr, size_t sz)
{
  char *ch = adr;
  printf (" =");
  do
    printf (" %02x", *ch++ & 0xff);
  while (--sz);
  puts ("");
}

int main (int argc, char **argv)
{
  if (argc > 1) {
    double d = atof (argv[1]);
    float f, f2, f3;
    int i, i2, i3;
    printf ("atof(%s) = %g", argv[1], d);
    dumphex (&d, sizeof(d));
    sscanf (argv[1], "%f", &f);
    printf ("sscanf(%s, \"%%f\", &f) assigns f = %g", argv[1], f);
    dumphex (&f, sizeof(f));
    printf ("(int)%g = %d", f, i=(int)f);
    dumphex (&i, sizeof(i));
    printf ("fabs(%g) = %g", f, f2=fabs(f));
    dumphex (&f2, sizeof(f2));
    printf ("ceilf(%g) = %d", f, i2=ceilf(f));
    dumphex (&i2, sizeof(i2));
    printf ("ceil(%g) = %d", f, i2=ceil((double)f));
    dumphex (&i3, sizeof(i3));
    printf ("exp(%g) = %g", f, f3=exp((double)f));
    dumphex (&f3, sizeof(f3));
    return 0;
  }
  return 2;
}






 
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